微波處理對多壁奈米碳管/環氧樹脂複合材料機械性質之影響

The Influence of Microwave on the Mechanical Properties of the MWNT/Epoxy Composites

沈文馨(Wen-Shin Shen)

指導教授 ： 葉孟考 ； 戴念華

國立清華大學/工學院/動力機械工程學系/碩士(2008年)

https://doi.org/10.6843/NTHU.2008.00291

摘要

微波(microwave)是一種頻率介於300 MHz至300 GHz之間，波長範圍從1 m至1 mm之電磁波。與傳統加熱方式相比，微波加熱具備高速加熱、高熱效率、均勻加熱及選擇性加熱等優點。本研究以田口法L9(34)直交表規劃設計實驗，探討奈米碳管含量、預熱時間、微波功率及微波時間等因子對於微波硬化製程所製備奈米碳管/環氧樹脂複合材料的機械特性之影響，以拉伸試驗所獲得之楊氏模數及拉伸強度作為奈米碳管/環氧樹脂複合材料之品質特性，所找出最佳化的微波硬化製程參數為0.5 wt%之奈米碳管含量、90分鐘之預熱時間、90 W之微波功率及短(short)微波時間，在95%信心水準下所得之最佳預測值與驗證之實驗值信心區間有重疊；本研究並以微波後處理熱壓硬化製程所製備之複合材料，發現對於碳管含量1.0 wt%之複合材料而言，與未微波後處理比較，以微波功率270 W後處理10秒可提升楊氏模數達8.51%。本研究並以場發射掃描式電子顯微鏡觀察奈米碳管/環氧樹脂複合材料之拉伸斷面，發現拉伸強度較高之複合材料在拉伸斷面上其奈米碳管被拉出的長度較長。

關鍵字

多壁奈米碳管 ； 環氧樹脂 ； 微波 ； 田口法 ； 複合材料

並列摘要

Microwave is an electromagnetic wave with the frequency ranging between 300 MHz to 300 GHz, and with the wavelength between 1 m to 1 mm. Microwave heating has several advantages such as high heating rate, high heating efficiency, uniform heating and selective heating when compared to the traditional heating method. Taguchi’s method with L9(34) orthogonal array was used to design the experiments, and discuss the influence of the factors such as the contents of the carbon nanotubes, pre-heating time, microwave power and microwave duration to the mechanical properties of the carbon nanotubes/epoxy composites. In this study, we take the Young’s modulus and the tensile strength which are obtained from the tensile test as quality characteristics of the carbon nanotubes/epoxy composites to find out the optimum parameters which are 0.5 wt% of the contents of the carbon nanotubes, 90 minutes of the pre-heating time, 90 W of the microwave power and short microwave duration. At the 95% confidence level, the confidence intervals of theoretical values and experimental results are overlapping. The carbon nanotubes/epoxy composites were fabricated by the hot press method and then were post processed by microwave irradiation with various durations and various powers, the Young’s modulus of carbon nanotubes/epoxy composites under microwave irradiation of 270 Watts for 10 seconds increased 8.51% when compared with the one without microwave irradiation. The SEM images of the tensile failure surface show that the pull out length of carbon nanotubes were longer with better tensile strength.

並列關鍵字

MWNTs ； Epoxy ； Microwave ； Taguchi's method ； Composites

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